Exam 12: Mineral and Soil Resources

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The soil layer that accumulates leached nutrients and minerals is called ___ or the ___.

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B

Besides being a precious metal used to make jewelry,gold is also considered a very expensive metal,environmentally speaking.What makes gold so environmentally costly

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Gold is a precious metal used primarily for jewelry and as a medium of exchange in many countries.Worldwide demand for gold is increasing,and the environment is suffering from the increased mining.The waste from mining and processing gold ore is enormous: 6 tons of wastes are produced to yield enough gold to make two wedding rings.One technology in particular,cyanide heap leaching,allows profitable mining when minuscule amounts of gold are present,but this process produces up to 3 million pounds of waste for every pound of gold produced.The world's largest gold mine,located in Indonesia,but owned by a U.S.company,dumps more than 100,000 tons of cyanide- contaminated waste into the local river each day.The highly toxic cyanide threatens waterfowl and fishes,as well as underground drinking water supplies.Small-scale miners use other extraction techniques with equally destructive side effects: soil erosion and production of silt clogs streams and threatens aquatic organisms,as does contamination from mercury used to extract the gold.The environmental hazards of gold mining do not end when the gold is carried away: If not disposed of properly,mining wastes cause long- term problems such as acid mine drainage and heavy-metal contamination.

The Earth's outermost rigid rock layer the ___ is composed of plates that float on the ___,the region of the mantle where rocks become hot and soft.

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Contour plowing,strip cropping,and terracing are soil conservation methods that are BEST suited to which of the following situations

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What is a rock Describe the different types of rocks to be found on the Earth's surface and explain how each type is formed.

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When do earthquakes occur

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Which of the following is NOT an important mineral

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How are San Francisco,California,and Mount Saint Helens,Washington related

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A highly toxic substance now being used to extract gold from low-grade ore is:

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The use of conventional tillage causes soil loss mainly because it:

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What is a mineral Compare and contrast the properties and uses of metallic and nonmetallic minerals.Include in your discussion three examples of metallic minerals and three examples of nonmetallic minerals.

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Why might an environmentalist argue that gold is an expensive metal

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When magma rises to the surface of the earth,it cools and solidifies to form ___ rock,but the rock that forms from altering other rocks through intense heat and pressure is ___ rock.

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Soil is composed of:

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When small fragments of eroded rocks or marine organisms are compacted together it forms:

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What is one of the BEST reasons to switch to conservation tillage

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Which of the following is/are EXTERNAL costs of mining

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The Conservation Reserve Program (CRP)is a voluntary subsidy program that pays farmers to stop producing crops on highly erodible farmland.Instead farmers are required to:

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Minerals that are usually malleable,good conductors of heat and electricity,and lustrous are called:

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Formation of sedimentary rock results from which of the following processes

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